android MQTT封装

黄大包2026-01-27 16:52

单纯的记录一下代码

  1. build.gradle

    implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.5'
    implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1'

  2. activity_mian.xml

    <?xml version="1.0" encoding="utf-8"?>

    <ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:fillViewport="true" tools:context=".MainActivity">

    复制代码 
     <LinearLayout
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="vertical"
     android:padding="16dp">

     <!-- 标题 -->
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginBottom="24dp"
         android:gravity="center"
         android:text="MQTT客户端演示"
         android:textColor="@color/colorPrimary"
         android:textSize="24sp"
         android:textStyle="bold" />

     <!-- 连接控制区 -->
     <androidx.cardview.widget.CardView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginBottom="16dp"
         app:cardCornerRadius="8dp"
         app:cardElevation="4dp">

         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"
             android:padding="16dp">

             <TextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="12dp"
                 android:text="连接控制"
                 android:textSize="18sp"
                 android:textStyle="bold" />

             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="horizontal">

                 <Button
                     android:id="@+id/btn_connect"
                     style="@style/Widget.AppCompat.Button.Colored"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
                     android:layout_marginEnd="8dp"
                     android:layout_weight="1"
                     android:text="连接" />

                 <Button
                     android:id="@+id/btn_disconnect"
                     style="@style/Widget.AppCompat.Button.Colored"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
                     android:layout_marginStart="8dp"
                     android:layout_weight="1"
                     android:text="断开" />

             </LinearLayout>
         </LinearLayout>
     </androidx.cardview.widget.CardView>

     <!-- 订阅区 -->
     <androidx.cardview.widget.CardView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginBottom="16dp"
         app:cardCornerRadius="8dp"
         app:cardElevation="4dp">

         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"
             android:padding="16dp">

             <TextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="12dp"
                 android:text="主题订阅"
                 android:textSize="18sp"
                 android:textStyle="bold" />

             <com.google.android.material.textfield.TextInputLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="12dp">

                 <EditText
                     android:id="@+id/et_subscribe_topic"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:hint="输入订阅主题"
                     android:textSize="16sp" />
             </com.google.android.material.textfield.TextInputLayout>

             <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:orientation="horizontal">

                 <Button
                     android:id="@+id/btn_subscribe"
                     style="@style/Widget.AppCompat.Button.Colored"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
                     android:layout_marginEnd="8dp"
                     android:layout_weight="1"
                     android:text="订阅" />

                 <Button
                     android:id="@+id/btn_unsubscribe"
                     style="@style/Widget.AppCompat.Button.Colored"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
                     android:layout_marginStart="8dp"
                     android:layout_weight="1"
                     android:text="取消订阅" />

             </LinearLayout>
         </LinearLayout>
     </androidx.cardview.widget.CardView>

     <!-- 消息发送区 -->
     <androidx.cardview.widget.CardView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_marginBottom="16dp"
         app:cardCornerRadius="8dp"
         app:cardElevation="4dp">

         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"
             android:padding="16dp">

             <TextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="12dp"
                 android:text="消息发送"
                 android:textSize="18sp"
                 android:textStyle="bold" />

             <com.google.android.material.textfield.TextInputLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="12dp">

                 <EditText
                     android:id="@+id/et_topic"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:hint="目标主题"
                     android:textSize="16sp" />
             </com.google.android.material.textfield.TextInputLayout>

             <com.google.android.material.textfield.TextInputLayout
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="16dp">

                 <EditText
                     android:id="@+id/et_message"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:gravity="top"
                     android:hint="消息内容"
                     android:minLines="3"
                     android:textSize="16sp" />
             </com.google.android.material.textfield.TextInputLayout>

             <Button
                 android:id="@+id/btn_send"
                 style="@style/Widget.AppCompat.Button.Colored"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:text="发送消息" />

         </LinearLayout>
     </androidx.cardview.widget.CardView>

     <!-- 日志显示区 -->
     <androidx.cardview.widget.CardView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         app:cardCornerRadius="8dp"
         app:cardElevation="4dp">

         <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"
             android:padding="16dp">

             <TextView
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_marginBottom="12dp"
                 android:text="日志信息"
                 android:textSize="18sp"
                 android:textStyle="bold" />

             <ScrollView
                 android:id="@+id/scroll_view"
                 android:layout_width="match_parent"
                 android:layout_height="200dp"
                 android:background="#f5f5f5"
                 android:padding="8dp">

                 <TextView
                     android:id="@+id/tv_log"
                     android:layout_width="match_parent"
                     android:layout_height="wrap_content"
                     android:fontFamily="monospace"
                     android:text="等待操作...\n"
                     android:textSize="14sp" />
             </ScrollView>
         </LinearLayout>
     </androidx.cardview.widget.CardView>
 </LinearLayout>
    </ScrollView>

  3. MainActivity.java

    package cn.wx.mqtt;

    import android.content.ComponentName;
    import android.content.Context;
    import android.content.Intent;
    import android.content.ServiceConnection;
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.IBinder;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.ScrollView;
    import android.widget.TextView;
    import android.widget.Toast;

    import androidx.appcompat.app.AppCompatActivity;

    public class MainActivity extends AppCompatActivity implements MQTTManager.MQTTCallback {
    private static final String TAG = "MQTTDemoActivity";

    复制代码 
     private MQTTService mqttService;
 private boolean isBound = false;
 private Handler mainHandler;

 // UI组件
 private Button connectButton;
 private Button disconnectButton;
 private Button subscribeButton;
 private Button unsubscribeButton;
 private Button sendButton;
 private EditText topicEditText;
 private EditText messageEditText;
 private EditText subscribeTopicEditText;
 private ScrollView scrollView;
 private TextView logTextView;

 private ServiceConnection serviceConnection = new ServiceConnection() {
     @Override
     public void onServiceConnected(ComponentName name, IBinder service) {
         MQTTService.LocalBinder binder = (MQTTService.LocalBinder) service;
         mqttService = binder.getService();
         isBound = true;

         // 初始化MQTT管理器
         mqttService.initializeMQTT(
                 "tcp://172.16.1.104:1883",  // 替换为你的MQTT服务器地址
                 "AndroidClient_" + System.currentTimeMillis(),
                 "",  // 用户名（如有需要）
                 ""   // 密码（如有需要）
         );

         // 设置回调
         mqttService.getMQTTManager().setCallback(MainActivity.this);

         updateUIState();
         appendLog("服务已连接");
     }

     @Override
     public void onServiceDisconnected(ComponentName name) {
         isBound = false;
         mqttService = null;
         updateUIState();
         appendLog("服务已断开");
     }
 };

 @Override
 protected void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);

     mainHandler = new Handler(getMainLooper());

     initViews();
     setupListeners();
     bindMQTTService();
 }

 private void initViews() {
     connectButton = findViewById(R.id.btn_connect);
     disconnectButton = findViewById(R.id.btn_disconnect);
     subscribeButton = findViewById(R.id.btn_subscribe);
     unsubscribeButton = findViewById(R.id.btn_unsubscribe);
     sendButton = findViewById(R.id.btn_send);

     topicEditText = findViewById(R.id.et_topic);
     messageEditText = findViewById(R.id.et_message);
     subscribeTopicEditText = findViewById(R.id.et_subscribe_topic);

     scrollView = findViewById(R.id.scroll_view);
     logTextView = findViewById(R.id.tv_log);

     // 设置默认值
     topicEditText.setText("test");
     subscribeTopicEditText.setText("test");
     messageEditText.setText("Hello from Android!");
 }

 private void setupListeners() {
     connectButton.setOnClickListener(v -> connectToMQTT());
     disconnectButton.setOnClickListener(v -> disconnectFromMQTT());
     subscribeButton.setOnClickListener(v -> subscribeToTopic());
     unsubscribeButton.setOnClickListener(v -> unsubscribeFromTopic());
     sendButton.setOnClickListener(v -> sendMessage());
 }

 private void bindMQTTService() {
     Intent intent = new Intent(this, MQTTService.class);
     bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);
     startService(intent); // 确保服务启动
 }

 private void connectToMQTT() {
     if (isBound && mqttService != null) {
         mqttService.getMQTTManager().connect();
     } else {
         showToast("服务未就绪");
     }
 }

 private void disconnectFromMQTT() {
     if (isBound && mqttService != null) {
         mqttService.getMQTTManager().disconnect();
     }
 }

 private void subscribeToTopic() {
     String topic = subscribeTopicEditText.getText().toString().trim();
     if (topic.isEmpty()) {
         showToast("请输入主题名称");
         return;
     }

     if (isBound && mqttService != null) {
         mqttService.getMQTTManager().subscribe(topic, 1);
     }
 }

 private void unsubscribeFromTopic() {
     String topic = subscribeTopicEditText.getText().toString().trim();
     if (topic.isEmpty()) {
         showToast("请输入主题名称");
         return;
     }

     if (isBound && mqttService != null) {
         mqttService.getMQTTManager().unsubscribe(topic);
     }
 }

 private void sendMessage() {
     String topic = topicEditText.getText().toString().trim();
     String message = messageEditText.getText().toString().trim();

     if (topic.isEmpty()) {
         showToast("请输入主题");
         return;
     }

     if (message.isEmpty()) {
         showToast("请输入消息内容");
         return;
     }

     if (isBound && mqttService != null) {
         mqttService.getMQTTManager().publish(topic, message, 1, false);
         appendLog("发送消息: " + message + " 到主题: " + topic);
     }
 }

 private void updateUIState() {
     runOnUiThread(() -> {
         if (isBound && mqttService != null) {
             boolean connected = mqttService.getMQTTManager().isConnected();
             connectButton.setEnabled(!connected);
             disconnectButton.setEnabled(connected);
             subscribeButton.setEnabled(connected);
             unsubscribeButton.setEnabled(connected);
             sendButton.setEnabled(connected);
         } else {
             connectButton.setEnabled(false);
             disconnectButton.setEnabled(false);
             subscribeButton.setEnabled(false);
             unsubscribeButton.setEnabled(false);
             sendButton.setEnabled(false);
         }
     });
 }

 private void appendLog(String message) {
     mainHandler.post(() -> {
         String timestamp = android.text.format.DateFormat.format("HH:mm:ss", System.currentTimeMillis()).toString();
         String logEntry = "[" + timestamp + "] " + message + "\n";
         logTextView.append(logEntry);

         // 自动滚动到底部
         scrollView.fullScroll(View.FOCUS_DOWN);
     });
 }

 private void showToast(String message) {
     mainHandler.post(() -> Toast.makeText(this, message, Toast.LENGTH_SHORT).show());
 }

 @Override
 public void onConnected() {
     appendLog("MQTT已连接");
     updateUIState();
 }

 @Override
 public void onDisconnected() {
     appendLog("MQTT已断开");
     updateUIState();
 }

 @Override
 public void onMessageReceived(String topic, String message) {
     appendLog("收到消息 - 主题: " + topic + ", 内容: " + message);
 }

 @Override
 public void onError(String error) {
     appendLog("错误: " + error);
     showToast(error);
 }

 @Override
 protected void onDestroy() {
     if (isBound) {
         unbindService(serviceConnection);
         isBound = false;
     }
     super.onDestroy();
 }

    }

  4. MQTTService.java

    package cn.wx.mqtt;

    import android.app.Service;
    import android.content.Intent;
    import android.os.Binder;
    import android.os.IBinder;
    import android.util.Log;

    public class MQTTService extends Service {
    private static final String TAG = "MQTTService";
    private final IBinder binder = new LocalBinder();
    private MQTTManager mqttManager;

    复制代码 
     public class LocalBinder extends Binder {
     public MQTTService getService() {
         return MQTTService.this;
     }
 }

 @Override
 public void onCreate() {
     super.onCreate();
     Log.d(TAG, "MQTT服务创建");
 }

 @Override
 public int onStartCommand(Intent intent, int flags, int startId) {
     Log.d(TAG, "MQTT服务启动");
     return START_STICKY; // 服务被杀死后会自动重启
 }

 @Override
 public IBinder onBind(Intent intent) {
     Log.d(TAG, "MQTT服务绑定");
     return binder;
 }

 @Override
 public boolean onUnbind(Intent intent) {
     Log.d(TAG, "MQTT服务解绑");
     return super.onUnbind(intent);
 }

 @Override
 public void onDestroy() {
     Log.d(TAG, "MQTT服务销毁");
     if (mqttManager != null) {
         mqttManager.cleanup();
     }
     super.onDestroy();
 }

 public void initializeMQTT(String serverUri, String clientId, String username, String password) {
     if (mqttManager == null) {
         mqttManager = new MQTTManager(this, serverUri, clientId, username, password);
     }
 }

 public MQTTManager getMQTTManager() {
     return mqttManager;
 }

    }

  5. MQTTManager.java

    package cn.wx.mqtt;

    import android.content.Context;
    import android.util.Log;

    import org.eclipse.paho.android.service.MqttAndroidClient;
    import org.eclipse.paho.client.mqttv3.IMqttActionListener;
    import org.eclipse.paho.client.mqttv3.IMqttDeliveryToken;
    import org.eclipse.paho.client.mqttv3.IMqttToken;
    import org.eclipse.paho.client.mqttv3.MqttCallbackExtended;
    import org.eclipse.paho.client.mqttv3.MqttConnectOptions;
    import org.eclipse.paho.client.mqttv3.MqttException;
    import org.eclipse.paho.client.mqttv3.MqttMessage;

    import java.util.concurrent.Executors;
    import java.util.concurrent.ScheduledExecutorService;
    import java.util.concurrent.TimeUnit;

    public class MQTTManager {
    private static final String TAG = "MQTTManager";
    private MqttAndroidClient mqttAndroidClient;
    private String serverUri;
    private String clientId;
    private String username;
    private String password;
    private Context context;
    private MQTTCallback callback;
    private ScheduledExecutorService reconnectExecutor;
    private boolean isConnected = false;
    private boolean isConnecting = false;
    private int reconnectInterval = 5; // 重连间隔(秒)
    private int maxReconnectAttempts = 12*2; // 最大重连次数 暂定两分钟
    private int reconnectAttempts = 0;

    复制代码 
     public interface MQTTCallback {
     void onConnected();
     void onDisconnected();
     void onMessageReceived(String topic, String message);
     void onError(String error);
 }

 public MQTTManager(Context context, String serverUri, String clientId, String username, String password) {
     this.context = context;
     this.serverUri = serverUri;
     this.clientId = clientId;
     this.username = username;
     this.password = password;
     this.reconnectExecutor = Executors.newSingleThreadScheduledExecutor();
     initClient();
 }

 private void initClient() {
     try {
         mqttAndroidClient = new MqttAndroidClient(context, serverUri, clientId);
         mqttAndroidClient.setCallback(new MqttCallbackExtended() {
             @Override
             public void connectComplete(boolean reconnect, String serverURI) {
                 Log.d(TAG, "连接完成: " + serverURI);
                 isConnected = true;
                 isConnecting = false;
                 reconnectAttempts = 0;
                 if (callback != null) {
                     callback.onConnected();
                 }
             }

             @Override
             public void connectionLost(Throwable cause) {
                 Log.e(TAG, "连接丢失", cause);
                 isConnected = false;
                 isConnecting = false;
                 if (callback != null) {
                     callback.onDisconnected();
                 }
                 attemptReconnect();
             }

             @Override
             public void messageArrived(String topic, MqttMessage message) throws Exception {
                 String msg = new String(message.getPayload());
                 Log.d(TAG, "收到消息 - 主题: " + topic + ", 内容: " + msg);
                 if (callback != null) {
                     callback.onMessageReceived(topic, msg);
                 }
             }

             @Override
             public void deliveryComplete(IMqttDeliveryToken token) {
                 Log.d(TAG, "消息发送完成");
             }
         });
     } catch (Exception e) {
         Log.e(TAG, "初始化MQTT客户端失败", e);
         if (callback != null) {
             callback.onError("初始化MQTT客户端失败: " + e.getMessage());
         }
     }
 }

 public void connect() {
     if (isConnected || isConnecting) {
         return;
     }

     isConnecting = true;
     try {
         MqttConnectOptions options = new MqttConnectOptions();
         options.setAutomaticReconnect(false); // 我们自己处理重连
         options.setCleanSession(true);
         options.setConnectionTimeout(10);
         options.setKeepAliveInterval(60);
         
         if (username != null && !username.isEmpty()) {
             options.setUserName(username);
         }
         if (password != null && !password.isEmpty()) {
             options.setPassword(password.toCharArray());
         }

         IMqttToken token = mqttAndroidClient.connect(options);
         token.setActionCallback(new IMqttActionListener() {
             @Override
             public void onSuccess(IMqttToken asyncActionToken) {
                 Log.d(TAG, "MQTT连接成功");
                 isConnected = true;
                 isConnecting = false;
                 reconnectAttempts = 0;
                 if (callback != null) {
                     callback.onConnected();
                 }
             }

             @Override
             public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                 Log.e(TAG, "MQTT连接失败", exception);
                 isConnected = false;
                 isConnecting = false;
                 if (callback != null) {
                     callback.onError("连接失败: " + exception.getMessage());
                 }
                 attemptReconnect();
             }
         });
     } catch (MqttException e) {
         Log.e(TAG, "连接MQTT服务器异常", e);
         isConnecting = false;
         if (callback != null) {
             callback.onError("连接异常: " + e.getMessage());
         }
         attemptReconnect();
     }
 }

 private void attemptReconnect() {
     if (reconnectAttempts < maxReconnectAttempts && !isConnected && !isConnecting) {
         reconnectAttempts++;
         Log.d(TAG, "尝试重连 (" + reconnectAttempts + "/" + maxReconnectAttempts + ")");
         reconnectExecutor.schedule(() -> {
             if (!isConnected) {
                 connect();
             }
         }, reconnectInterval, TimeUnit.SECONDS);
     } else if (reconnectAttempts >= maxReconnectAttempts) {
         Log.e(TAG, "达到最大重连次数，停止重连");
         if (callback != null) {
             callback.onError("达到最大重连次数，连接失败");
         }
     }
 }

 public void subscribe(String topic, int qos) {
     if (!isConnected) {
         Log.w(TAG, "未连接到MQTT服务器，无法订阅主题");
         return;
     }

     try {
         IMqttToken token = mqttAndroidClient.subscribe(topic, qos);
         token.setActionCallback(new IMqttActionListener() {
             @Override
             public void onSuccess(IMqttToken asyncActionToken) {
                 Log.d(TAG, "订阅主题成功: " + topic);
             }

             @Override
             public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                 Log.e(TAG, "订阅主题失败: " + topic, exception);
                 if (callback != null) {
                     callback.onError("订阅主题失败: " + exception.getMessage());
                 }
             }
         });
     } catch (MqttException e) {
         Log.e(TAG, "订阅主题异常: " + topic, e);
         if (callback != null) {
             callback.onError("订阅异常: " + e.getMessage());
         }
     }
 }

 public void unsubscribe(String topic) {
     if (!isConnected) {
         Log.w(TAG, "未连接到MQTT服务器，无法取消订阅");
         return;
     }

     try {
         IMqttToken token = mqttAndroidClient.unsubscribe(topic);
         token.setActionCallback(new IMqttActionListener() {
             @Override
             public void onSuccess(IMqttToken asyncActionToken) {
                 Log.d(TAG, "取消订阅主题成功: " + topic);
             }

             @Override
             public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                 Log.e(TAG, "取消订阅主题失败: " + topic, exception);
                 if (callback != null) {
                     callback.onError("取消订阅失败: " + exception.getMessage());
                 }
             }
         });
     } catch (MqttException e) {
         Log.e(TAG, "取消订阅主题异常: " + topic, e);
         if (callback != null) {
             callback.onError("取消订阅异常: " + e.getMessage());
         }
     }
 }

 public void publish(String topic, String message, int qos, boolean retained) {
     if (!isConnected) {
         Log.w(TAG, "未连接到MQTT服务器，无法发送消息");
         if (callback != null) {
             callback.onError("未连接到MQTT服务器，无法发送消息");
         }
         return;
     }

     try {
         MqttMessage mqttMessage = new MqttMessage();
         mqttMessage.setPayload(message.getBytes());
         mqttMessage.setQos(qos);
         mqttMessage.setRetained(retained);

         IMqttToken token = mqttAndroidClient.publish(topic, mqttMessage);
         token.setActionCallback(new IMqttActionListener() {
             @Override
             public void onSuccess(IMqttToken asyncActionToken) {
                 Log.d(TAG, "消息发送成功 - 主题: " + topic + ", 内容: " + message);
             }

             @Override
             public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                 Log.e(TAG, "消息发送失败", exception);
                 if (callback != null) {
                     callback.onError("消息发送失败: " + exception.getMessage());
                 }
             }
         });
     } catch (MqttException e) {
         Log.e(TAG, "消息发送异常", e);
         if (callback != null) {
             callback.onError("消息发送异常: " + e.getMessage());
         }
     }
 }

 public void disconnect() {
     try {
         if (mqttAndroidClient != null && mqttAndroidClient.isConnected()) {
             IMqttToken token = mqttAndroidClient.disconnect();
             token.setActionCallback(new IMqttActionListener() {
                 @Override
                 public void onSuccess(IMqttToken asyncActionToken) {
                     Log.d(TAG, "MQTT断开连接成功");
                     isConnected = false;
                     isConnecting = false;
                     if (callback != null) {
                         callback.onDisconnected();
                     }
                 }

                 @Override
                 public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
                     Log.e(TAG, "MQTT断开连接失败", exception);
                     if (callback != null) {
                         callback.onError("断开连接失败: " + exception.getMessage());
                     }
                 }
             });
         }
     } catch (MqttException e) {
         Log.e(TAG, "断开MQTT连接异常", e);
         if (callback != null) {
             callback.onError("断开连接异常: " + e.getMessage());
         }
     }
 }

 public void setCallback(MQTTCallback callback) {
     this.callback = callback;
 }

 public boolean isConnected() {
     return isConnected;
 }

 public void setReconnectInterval(int seconds) {
     this.reconnectInterval = seconds;
 }

 public void setMaxReconnectAttempts(int attempts) {
     this.maxReconnectAttempts = attempts;
 }

 public void cleanup() {
     if (reconnectExecutor != null && !reconnectExecutor.isShutdown()) {
         reconnectExecutor.shutdown();
     }
     disconnect();
 }

    }

  6. AndroidManifest.xml

    <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android">
    复制代码 
     <uses-permission android:name="android.permission.INTERNET" />
 <uses-permission android:name="android.permission.WAKE_LOCK" />
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
 <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

 <application
     android:allowBackup="true"
     android:dataExtractionRules="@xml/data_extraction_rules"
     android:fullBackupContent="@xml/backup_rules"
     android:icon="@mipmap/ic_launcher"
     android:label="@string/app_name"
     android:roundIcon="@mipmap/ic_launcher_round"
     android:supportsRtl="true"
     android:theme="@style/Theme.Mqtttest">

     <activity
         android:name=".MainActivity"
         android:exported="true">
         <intent-filter>
             <action android:name="android.intent.action.MAIN" />
             <category android:name="android.intent.category.LAUNCHER" />
         </intent-filter>
     </activity>
     <service android:name=".MQTTService"
         android:enabled="true"
         android:exported="false" />
     <service android:name="org.eclipse.paho.android.service.MqttService" />
 </application>
    </manifest>

结束

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